…and a voice from the cloud said,
“This is my beloved Son, with whom I am well pleased; listen to him.”
When the disciples heard this, they fell on their faces, and were filled with awe.
(Matthew 17:5-6)

This passage is from account of the Transfiguration, read Matthew 17:1-9 to understand the full context.  Peter, James and John; 1) hear the voice of God the Father 2) see God the Son in His glory. They were in the presence of the LORD and were in awe, in fear, and they responded to that fear by falling face first to the ground.

Has our modern society lost the sense of fear of the LORD? How often to we fall to the ground and humble our selves when we pray?  How often do we humbly acknowledge that everything we have comes from the LORD, the air in our lungs, the blood in our hearts, even the gift of free will comes from God. The free will to choose whether or not to humble ourselves by falling prostrate before Jesus, who humbled Himself by dieing on the cross for the forgiveness of our sins.